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CSF (Config Server Firewall) is an iptables management script and logging daemon.

Command Line Options

csf -h - get help for CSF command line options

csf -g IP_Address - Look (grep) for an IP address to see if it's blocked

csf -a IP_Address - permanently allows the specified IP address

csf -d IP_Address "Your comment goes here" - Blocks the specified IP address, comment tells why

csf -dr IP_Address - Removes a blocked IP from being blocked

csf -ra - Restart CSF and LFD (leave off the a to restart just CSF)

Configuration Files

CSF and LFD settings are stored in:

csf.conf - main CSF configuration file


See Log Locations

LFD (the logging daemon component of CSF) by default sends e-mails to root. If you want to send the e-mails somewhere else, you have two options:

- Specify an e-mail address in LF_ALERT_TO = in csf.conf

- Setup a forwarder in WHM>>Server Contacts>>Edit System Mail Preferences (this is the preferred method for cPanel servers.)

There is a third option.

LFD stores all the alert templates in: /etc/csf/alerts

If the LF_ALERT_TO = setting in csf.conf is blank, LFD will use the settings in the templates.

You can change the "from" and "to" settings in these templates to change where the e-mails for each are delivered, but you have to modify each template (as opposed to changing them all at once in csf.conf)

This does give you the option to specify a different e-mail address for each alert.


  1. Linux FAQ Manage CSF